Are you using the PC DATA connector to have the KPA1500 automatically
follow the frequency of your transceiver? If so, try setting MENU:RADIO
POLL OFF; commands from the amp. could be interfering with radio commands
from WSJT-X/OmniRig. You might also try a slower or faster baud rate in
both the
Also on this related thread:
We're way over the posting limit on this one. Let's close this thread for now.
(And, in the future, please voluntarily close long threads well before I happen
to stop by :-)
73,
Eric
/elecraft.com/
On 8/17/2018 5:13 PM, Fred Jensen wrote:
Yes. Electricity cost to
Seems like this discussion would be functional if it were ways to quiet the
fans without compromising the efficiency of the cooling.
Chuck Jack
KE9UW
Sent from my iPhone, cjack
> On Aug 17, 2018, at 7:13 PM, Fred Jensen wrote:
>
> Yes. Electricity cost to generate the RF that earns the rev
We're way over the posting limit on this one. Let's close this thread for now.
(And, in the future, please voluntarily close long threads well before I happen
to stop by :-)
73
Eric
/elecraft.com/
__
Elecraft mailing list
Home: http
Yes. Electricity cost to generate the RF that earns the revenue is a
major part of the broadcast station budget. Not so much for amateurs.
Since FM is constant envelope modulation, it makes sense it would have a
lower overall efficiency. Even Rush Limbaugh has to take a breath
occasionally
Yes, it was Class C ... FM is constant envelope modulation. The ancient
50's/60's rules of thumb were:
Class A: 25% - really linear
Class B: 50% - linear with crossover distortion
Class C: 75% - exceedingly non-linear
Class AB1: between A & B, no grid current - mitigates crossover
disto
Today in broadcast we generally rate transmitters by AC in to RF out. For AM
transmitters that figure is in the low 90 percent range and the current FMs run
at about 74% AC in to RF out.
Sent from my iPad
> On Aug 17, 2018, at 11:48 AM, Fred Jensen wrote:
>
> Well, only if you've figured out
Actually a class C amplifier can be made to perform as a linear. The technology
is over 60 years old but I don’t think it has ever been tried in amateur
service.
Sent from my iPad
> On Aug 17, 2018, at 3:06 PM, Bill Frantz wrote:
>
> And I would guess it was running in class C, which is not
And I would guess it was running in class C, which is not
linear, so only useful for certain modes (including FM). Class C
can convert most of the input power to RF power.
73 Bill AE6JV
On 8/17/18 at 11:48 AM, k6...@foothill.net (Fred Jensen) wrote:
One 10 KW FM transmitter I helped build use
Sure. That's why during every QSO I ask my partner, "Can you still hear me?"
If he says, "Yes", I reduce power and ask again. Eventually, we determine the
minimum power necessary. Then the band changes and we start over.
Kind of slows down pileups and contesting, but rule are rules, right?
The theory states that
Power in = U I
Power out ~ I*I*r
So power-in is linear with current. Power-out is quadratic with current.
Driving hard helps efficiency but hurts linearity. Max efficiency with LDMOS
is about 60% with reasonable linearity and no feedback, but could be > 70%
with pred
On 8/17/2018 11:20 AM, Wes Stewart wrote:
Something to bear in mind in this discussion is that we run our
equipment in ICAS, not CCS. Even in a contest situation we probably
only transmit half the time. During the off (RX) time the amp isn't
drawing any plate, collector or drain current, nor
Well, only if you've figured out a way to divide by zero. [:-)
The term "amplifier efficiency" must have changed dramatically since I
worked in broadcast nearly a lifetime ago. Then, it was the ratio
[expressed as a percentage] of the RF power delivered to the 3 1/8"
hardline divided by the D
Yes for the US at least. However to provide effective communications,
is a subjective term, therefore the entire requirement is vague.
Rick nhc
On 8/17/2018 11:43 AM, Lynn W. Taylor, WB6UUT wrote:
Isn't there a rule about using the minimum power necessary?
_
-Original Message-
From: elecraft-bounces at mailman.qth.net On
Behalf Of john at kk9a.com
Sent: Friday, August 17, 2018 8:57 AM
To: elecraft at mailman.qth.net
Cc: charles at k5ua.com
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
Interesting data, Charles. I a
ay, August 17, 2018 8:57 AM
To: elecraft at mailman.qth.net
Cc: charles at k5ua.com
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
Interesting data, Charles. I assumed that running the KPA1500 (or KPA500)
at lower power would keep the fan from running as much. I knew that
On 8/17/2018 6:43 AM, j...@kk9a.com wrote:
So why do most RTTY users run their amps at reduced power?
Because they don't understand how amplifiers work. :)
73, Jim K9YC
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/li
some drive, read some output and the efficiency goes up from there.
73, Charlie k3ICH
-Original Message-
From: elecraft-bounces at mailman.qth.net On
Behalf Of john at kk9a.com
Sent: Friday, August 17, 2018 8:57 AM
To: elecraft at mailman.qth.net
Cc: charles at k5ua.com
Subject: [Ele
KK9A wrote:
"...if the heat generated is approximately the same with all power levels,
why do RTTY ops use lower power..."
First, the heat generated is not actually approximately the same with all
power levels. To a first crude approximation, the heat generated is made up
of two components. One c
so THAT's why they back off on the RTTY
output.
73, Charlie k3ICH
-Original Message-
From: elecraft-bounces at mailman.qth.net On
Behalf Of john at kk9a.com
Sent: Friday, August 17, 2018 9:43 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KPA-1500 Efficiency As A Funct
mailman.qth.net On
Behalf Of john at kk9a.com
Sent: Friday, August 17, 2018 9:43 AM
To: elecraft at mailman.qth.net
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
So why do most RTTY users run their amps at reduced power?
John KK9A
From: Charlie K3ICH
Date: Fri Aug 17 0
Not sure why that's a surprise. It's a linear amp ... the bias point is
what draws the current, and therefore essentially determines the
dissipation. There's nothing remarkable about it.
Amplifier 101.
Dave AB7E
On 8/16/2018 10:17 PM, char...@k5ua.com wrote:
Thanks for the replies.
U
man.qth.net mailman.qth.net> On
> Behalf Of john at kk9a.com
> Sent: Friday, August 17, 2018 8:57 AM
> To: elecraft at mailman.qth.net
> Cc: charles at k5ua.com
> Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
>
> Interesting data, Charles.
@mailman.qth.net On
Behalf Of j...@kk9a.com
Sent: Friday, August 17, 2018 8:57 AM
To: elecraft@mailman.qth.net
Cc: char...@k5ua.com
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
Interesting data, Charles. I assumed that running the KPA1500 (or KPA500)
at lower power would keep
I've said this and measured this for years with tube type amps, where as
I hear hams say they are running reduced power to "save the tubes".
That's HOGWASH. Determine the efficiency at reduced power vs. rated
power. The excessive heat at reduced power has to go somewhere.
I view running
Because the effect of power dissipation over time is temperature
increase. RTTY has a high duty cycle (100% when you are transmitting),
compared to 50% for CW and usually something less for SSB (it depends on
the amount of compression). So more heat is produced when you run RTTY,
which the ampl
, Charlie k3ICH
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of j...@kk9a.com
Sent: Friday, August 17, 2018 9:43 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
So why do most RTTY users run their amps at reduced power?
J
Charles,
It is just like your car. You get great gas mileage at certain speeds and
driving methods.
Worse is at lower speeds, stop and go, and 55 -65 Mph is a good speed for
having an efficient mileage car. However, 70-80 is worse on the mileage.
Everything has a sweet spot. Nothing is for free as
ehalf Of john at kk9a.com
Sent: Friday, August 17, 2018 8:57 AM
To: elecraft at mailman.qth.net
Cc: charles at k5ua.com
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
Interesting data, Charles. I assumed that running the KPA1500 (or KPA500)
at lower power would keep the fan
Thanks to all that commented. Just wanted to make sure this was normal
operating behavior. Seemed counter-intuitive but now I think I
understand it. Maybe will run a "Time to Temp" test running low power
vs. high power. Just curious.
Charles K5UA
For those curious about the reasons for high power draw at low
power out, it might be useful to review the handbook discussion
of amplifiers, and the characteristics of class A, B, and C designs.
73 Bill AE6JV
--
Bill Frantz|
Apply some drive, read some output and the efficiency goes up from there.
73, Charlie k3ICH
-Original Message-
From: elecraft-boun...@mailman.qth.net On
Behalf Of j...@kk9a.com
Sent: Friday, August 17, 2018 8:57 AM
To: elecraft@mailman.qth.net
Cc: char...@k5ua.com
Subject: [Elecraft
"There was a similar post about the KPA500 in the last year or so. Elecraft
responded that the amp was designed for 500 Watts running less was less
efficient and running amp at low power was doing it no favors. "
Here is an example of measured PA dissipation for a KPA500:
https://www.dropbox.co
Interesting data, Charles. I assumed that running the KPA1500 (or KPA500)
at lower power would keep the fan from running as much. I knew that
efficiency changed with output power but I did not expect that it was this
significant. If your data is correct there is 1000++ watts of heat to
dissipate n
I believe most every electrical device and piece of equipment will have some
type efficiency curve for power in and power out.
A motor sitting at idle is using power, but doing almost no real work.
However, at no load it is still using watts. Typically a motor has the best
efficiency at around 75%
craft-boun...@mailman.qth.net On
Behalf Of char...@k5ua.com
Sent: Friday, August 17, 2018 1:18 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500 Efficiency As A Function of Input Power
Thanks for the replies.
Upon further testing, I have found that the efficiency of the KPA-1500 is
v
" Upon further testing, I have found that the efficiency of the KPA-1500 is
varies greatly with driving power."
That's the reason SPE amps have a power range selection choice setting. (Me
thinks)
73, RoyK6XK
__
Elecraft
There was a similar post about the KPA500 in the last year or so. Elecraft
responded that the amp was designed for 500 Watts running less was less
efficient and running amp at low power was doing it no favors.
With the KPA500, so many wanted 1500 W so now you have it, you want to run less?
Sen
Thanks for the replies.
Upon further testing, I have found that the efficiency of the KPA-1500
is varies greatly with driving power. The following table illustrates
the relationships between exciter power, voltage, current,
power-in(voltage x amps), power-out, efficiency, and dissipated power
Sounds like an issue with the WSJT-X (Hamlib) software not the
KPA-1500. I suggest you take the matter up with the developers
or WSJT-X and hamlib
73,
... Joe, W4TV
On 2018-08-16 1:10 PM, Richard Zalewski wrote:
I have been experiencing an intermittent problem with the KPA-1500,
TS-99
HI,
My experience is that you should use OmniRig as the control in WSJT-X. Do
not use HamLib.
73
-Original Message-
From: Richard Zalewski
Sent: Thursday, August 16, 2018 1:10 PM
To: Elecraft Reflector
Subject: [Elecraft] KPA-1500 changes modes
I have been experiencing an
I have been experiencing an intermittent problem with the KPA-1500,
TS-990. When running WSJT-X (USB) occasionally the 990 goes to AM-D1
mode. No reason I can see for it to do that. It does this in RECEIVE.
Just to be sure however I put lots of ferrite on all leads involved..
Richard
*W7ZR* ex:
I would think these RF input versus RF output numbers are reasonable.
Everyone's setup will vary for all bands.
I haven't looked at the KPA-1500 Utility in a while, but "real" efficiency
of the amplifier is a different calculation. Amp efficiency is Power Input
versus Power Output, and per Elecraf
There's no way 40W drives exactly 1500W on all bands. Here's what I get
into a DL (no tuner). Power measurements based on the LP100 which was
calibrated by Larry last year - not what I would call a current cal but
certainly better than a generic Bird. Feed with a key-down in CW, with
the dat
Are you saying it took exactly 40W input on each band to produce 1500W out..
I find the gain of the amp very different from band to band. For
example on 80M mine takes 32W to produce 1500W into a dummy load, and
15M it takes 47W to produce 1500W in to a dummy load. That's a
variation of 1.7dB,
Just wondering, how much power will the KPA-1500 put into a dummy load?
73 Darrell AB2E
From: elecraft-boun...@mailman.qth.net on
behalf of char...@k5ua.com
Sent: Wednesday, August 15, 2018 10:40 PM
To: elecraft@mailman.qth.net
Subject: [Elecraft] KPA-1500
Just curious what other users of the KPA-1500 see as the efficiency
reported by the KPA-1500 utility app.
The following efficiencies are being report by my KPA-1500 utility app
by band into a dummy load running 40 watts input and 1500 watts output:
80M CW: 61%
80M SSB: 64%
40M CW: 54%
40
Would a CI-V cable work for you? I personally tested IC7600 and 7300 and I’ve
been told that 7610 also works. The amp looks for the TX frequency message from
the exciter. I’m not sure whether a 765 pro 2 sends that. If it doesn’t, I can
teach KPA1500 firmware to look for the frequency message t
Good day group I am wondering is there a way to change bandson my KPA 1500 by
selecting the band on my ICom 756 Pro 2. I have no issueswith the changing
bands via a Rf burst. But I would really like it to change bands but selecting
the correct band from my radio.
Thanks you in advance
Cod
In other words!
Keep It Simple Stupid! .KISS!
Milverton / W9MMS.
On Wednesday, August 1, 2018, 7:49:36 PM CDT, K9MA
wrote:
If one is going to remote the KPA1500, wouldn't it make a lot more sense
to extend the 240 V AC line? Or just install a 240 V outlet at the
amplifier
If one is going to remote the KPA1500, wouldn't it make a lot more sense
to extend the 240 V AC line? Or just install a 240 V outlet at the
amplifier location.
73,
Scott K9MA
On 8/1/2018 16:17, j...@kk9a.com wrote:
That is why I said "IF" you are making a longer cable...
John KK9A
David Bun
On 8/1/2018 12:44 PM, j...@kk9a.com wrote:
eventually I
purchased a crimper and connectors and made cables myself.
Call me old-fashioned, but I've installed hundreds of Power Pole
connectors mostly the smaller red/white ones used on the K3, but also
the much larger grey ones that accommodate
That is why I said "IF" you are making a longer cable...
John KK9A
David Bunte K9FN wrote:
I am also a bit confused (not the first time), but I could have SWORN that
the initial query was from someone who wanted a SHORTER cable.
Dave - K9FN
On Wed, Aug 1, 2018 at 3:45 PM john at kk9a.com wro
I am also a bit confused (not the first time), but I could have SWORN that
the initial query was from someone who wanted a SHORTER cable.
Dave - K9FN
On Wed, Aug 1, 2018 at 3:45 PM j...@kk9a.com wrote:
> Elecraft was my first experience with power pole connectors and I have
> purchased custom c
WHICH is why I detailed in the VERY beginning on this thread how to make
the longer cable using 4AWG (or larger if desired). The ONLY place the
cable would not be the larger gauge would be in the crimp terminal...
IF anyone is interested, I will repost what I wrote or just email
me offli
Elecraft was my first experience with power pole connectors and I have
purchased custom cables from Powerwerx. They did a nice job, eventually I
purchased a crimper and connectors and made cables myself. If you are
making the KPA1500 cable longer than the factory cable it is probably
desirable to u
I'm missing something here!I keep seeing the question being asked, " What size
cable is the power cord?"
How about employing the KISS theory.
Would it not make sense to make up an extension cord with a length to the
approximate
desired location from the power source?
Such an extension would
Mike,
I went directly to Elecraft with my question. The answer is 6g.
I was told to be sure to use the correct crimp tool for the job. If I
make the cable I'll probably just have Powerwerx handle it as they have
the correct hydraulic tool for the job.
Rich - N5ZC
On 8/1/2018 12:56 PM, Mike
Okay have looked over the posts, but somehow have missed the actual
AWG(American wire gage) SIZE of the stock DC pair? Anyone KNOW this or maybe
even micro-ohm tested (a long shot) it? Voltage drop (ps to amp) divided by
full load dc amps would be close enough.
73,
Mike AC5P
On Tues
On 7/31/2018 2:40 PM, K8ZCT wrote:
Jim,
Please accept my apologies.
Sorry for giving you Kudo's for the wrong Handbook. I should have stated that you are are a contributor to
the 2018 Edition of "The ARRL Handbook". I have many of your articles and to be honest the ARRL
"Grounding Book" has a
Jim,
Please accept my apologies.
Sorry for giving you Kudo's for the wrong Handbook. I should have stated
that you are
are a contributor to the 2018 Edition of "The ARRL Handbook". I have many of
your articles
and to be honest the ARRL "Grounding Book" has a lot of information that is
also in th
Points to consider. A legal limit amp dissipates ~1kW of heat. Small compact
amps must provide the same heat dissipation as physically large amps. Thus
airflow must increase in order to cool the components in a physically small
case amp. Physically large amps have more room and slower airflow
Good, Fast, Cheap ... choose two.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 7/31/2018 7:21 AM, Bob McGraw K4TAX wrote:
Otherwise a science project with unknown results.
Bob, K4TAX
Sent from my iPhone
On Jul 31, 2018, at 7:59 AM, Clay Autery wrote:
Every successful projec
On 7/31/2018 5:13 AM, K8ZCT wrote:
Jim Brown is on the National Electrical Code Committee,
Sorry, I'm not, and have never been. I do own an old copy of the NEC
code, and have studied parts of it that affect the pro audio systems
that I designed before I retired. I am a member of the AES Stan
Otherwise a science project with unknown results.
Bob, K4TAX
Sent from my iPhone
> On Jul 31, 2018, at 7:59 AM, Clay Autery wrote:
>
> Every successful project begins with a thorough analysis of the REQUIREMENTS
> and CONDITIONS.
> Proper design seeks to satisfy the entries on these lists w
Every successful project begins with a thorough analysis of the
REQUIREMENTS and CONDITIONS.
Proper design seeks to satisfy the entries on these lists within the
available funding.
Success when skipping these steps is pure luck and coincidence.
73,
__
Clay Autery, KY5G
(31
Jim Brown is on the National Electrical Code Committee, so he knows what he
is saying and I would trust his opinion 100%!
I guess my thought on any remote wiring is, if your really going to go
through all the effort to do the project, then do it with materials, that
you know when you purchase them
: elecraft-boun...@mailman.qth.net On
Behalf Of Jim Brown
Sent: Monday, July 30, 2018 3:32 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 Power Supply Cable Size
On 7/30/2018 6:43 AM, K8ZCT wrote:
> Speaker wire is made for speaker systems. Although it may look like "lamp
>
On 7/30/2018 6:43 AM, K8ZCT wrote:
Speaker wire is made for speaker systems. Although it may look like "lamp cord"
it is not listed for use to wire up a lamp.
Right -- it has to do with voltage breakdown of the insulation, which
must be 3kV on the AC power line (in the case of a lightning spi
One of previous posts recommended using speaker wire for the remote
connection of the KPA-1500 amplifier to the KPA-1500 power supply.
Speaker wire is made for speaker systems. Although it may look like "lamp
cord" it is not listed
for use to wire up a lamp. You should buy rated "lamp cord" for th
Context?
Sent from my iPad
> On Jul 30, 2018, at 4:12 AM, K8ZCT wrote:
>
> I don't think speaker cable has a voltage rating for this purpose.
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> __
> Elecraft mailing list
I don't think speaker cable has a voltage rating for this purpose.
--
Sent from: http://elecraft.365791.n2.nabble.com/
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.ht
: Larry (K8UT) [mailto:k...@charter.net]
Sent: Saturday, July 28, 2018 3:30 PM
To: j...@kk9a.com; elecraft@mailman.qth.net
Subject: Re: [Elecraft] KPA-1500 Power Supply Cable Size
I purchased 75 amp Anderson Powerpole connectors and #6 flex speaker cable from
Debco Electronics for my extension
Presuming of course that the "zip cord" cable stock is the size and
flexibility you want/"need". PP crimp tools are hardly exotic And
believe it or not some of us enjoy making our own cables...
__
Clay Autery, KY5G
(318) 518-1389
On 28-Jul-18 22:11, Phil Kane wr
On 7/28/2018 1:57 PM, Clay Autery wrote:
> Only problem, besides price, for the Powerwerx custom cables is that
> they don't have twisted pair only parallel conductors.
Split the PP. Split the conductors. Do the twist. Re-slide the PPs.
I've done that on a bunch of cables. Does not require
m: Richard Thorne
Date: 7/28/18 16:06 (GMT-06:00) To: Clay Autery , Elecraft
Reflector Subject: Re: [Elecraft] KPA-1500 Power
Supply Cable Size
Clay,
For a one time deal, the price is competitive compared to buying the
tools, cable and PP's to do it yourself.
: Elecraft Reflector
Subject: Re: [Elecraft] KPA-1500 Power Supply Cable Size
Looks like I can order a custom cable from powerwerx.com with 75 amp
power poles and 6g wire (assuming that's the correct size).
https://powerwerx.com/custom-dc-power-cables
The crimp tool is not too expensive so
)
-- Original Message --
From: "Clay Autery"
To: "Richard Thorne" ; "Elecraft Reflector"
Sent: 2018-07-28 16:57:52
Subject: Re: [Elecraft] KPA-1500 Power Supply Cable Size
Only problem, besides price, for the Powerwerx custom cables is that
they don't h
craft Reflector
Subject: Re: [Elecraft] KPA-1500 Power Supply Cable
Size
Looks like I can order a custom cable from powerwerx.com with 75 amp
power poles and 6g wire (assuming that's the correct size).
https://powerwerx.com/custom-dc-power-cables
The crimp tool is not too expensive so
Looks like I can order a custom cable from powerwerx.com with 75 amp
power poles and 6g wire (assuming that's the correct size).
https://powerwerx.com/custom-dc-power-cables
The crimp tool is not too expensive so it may be worth buying the tool
and rolling my own. I've used 15,30 and 45 amp P
7;Elecraft Reflector'"
Sent: 2018-07-28 15:21:03
Subject: [Elecraft] KPA-1500 Power Supply Cable Size
The 75 amp Powerpole connector is designed for 6, 8 or 10 AWG wire so
you
might have problems squeezing a larger wire in.
John KK9A
[Elecraft] KPA-1500 Power Supply Cable Size
The 75 amp Powerpole connector is designed for 6, 8 or 10 AWG wire so you
might have problems squeezing a larger wire in.
John KK9A
[Elecraft] KPA-1500 Power Supply Cable Size
Clay Autery KY5G at montac.com
If it uses a 75 Amp PP connector, my inclination would be to use the
6AWG MINIMUM
If it uses a 75 Amp PP connector, my inclination would be to use the
6AWG MINIMUM. I would be tempted to use the flexible welding cable lead
stock in the largest gauge I could fit in the application space. I'd
trim down the end of the conductor to JUST fit into the 75 AMP crimp
contact. Then
I don't see it documented, but it uses a 75A PowerPole connector. Cable
thickness (with insulation) is 1/3rd of an inch so I'm guessing it's AWG
#6. It's VERY heavy.
73,
Bob, N6TV
On Sat, Jul 28, 2018 at 5:04 AM, Richard Thorne wrote:
> What gauge wire is used for the HV line between the powe
What gauge wire is used for the HV line between the power supply and
amp? I'd like to build or source a shorter cable.
Thanks
Rich - N5ZC
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Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mai
OK I don't have a KPA-500 to take apart and play with, but I just
spent about an hour reviewing the images in the assembly manual, et al.
Yep It is likely the thermal expansion and contraction of the
relatively thin aluminum Z-bracket. The Z-bracket appears to be acting
as a heat sin
Behalf Of Hisashi T Fujinaka
Sent: Saturday, July 14, 2018 6:00 PM
To: Ronald Genovesi
Cc: Elecraft Reflector
Subject: Re: [Elecraft] KPA 1500
And just to follow up on that, I ordered one at the SEAPAC hamfest on
6/2 and it's supposed to be out for delivery today.
Got the 220V outlet put in
And just to follow up on that, I ordered one at the SEAPAC hamfest on
6/2 and it's supposed to be out for delivery today.
Got the 220V outlet put in, but it's in a remote location in the
basement and I'm too lazy to go out in the heat to re-run the feedline
to it.
On Sat, 14 Jul 2018, Ronald Gen
For those still tracking delivery time for the KPA 1500, Serial #328
ordered
5-7-18 arrived yesterday.
Ron Genovesi
n3...@coastside.net
__
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Richard,
It is always "safe" to load the Elecraft beta firmware. It has already
been tested by some hams (admittedly a small group), but you can be
confident it will not break your K3/KX3/KX2.
You may discover some bugs - if you do, report them to supp...@elecraft.com.
73,
Don W3FPR
On 6/27
Is it safe yet to load the latest beta or should we still wait for the
release?
Richard
*W7ZR* ex:5C5Z, CN2ZR, K2JSP, W6SBZ, W7KXR, K9ZIJ, W9KNF, W0KDF, W0MQU,
J68ZR, KC6ZR, PJ4/W7ZR, KH2,W7ZR, KH6/W7ZR, V31ZR, VK4AAZ, XE2DV
*Be joyful in hope, patient in affliction, faithful in prayer*
He already knows this. He asked if it was USB 1.0 or 2.0 compliant.
I am sure it’s USB 2.0 compliant. I don’t know why anyone would sell a USB 1.0
or 1.1 cable today. They are backwards compatible I think.
Sent from my iPhone
...nr4c. bill
> On Jun 25, 2018, at 2:26 PM, Paul Ferguson wrote:
Art,
The USB cable needs a Type-A connector on one end and a Type-B
connector on the other end.
73,
Paul
K5ESW
> Is the USB A to B cable needed for the connection to the Utility a
> standard USB or USB 2? I need to order a longer one to accommodate
> where the amp will be placed relative to the
Is the USB A to B cable needed for the connection to the Utility a standard USB
or USB 2? I need to order a longer one to accommodate where the amp will be
placed relative to the computer.
Thanks.
Art KZ5D
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Ho
I would make a call to Elecraft Service support and get their advice.
73
Bob, K4TAX
K3S s/n 10163
KPA500 s/n 3519
On 6/24/2018 3:25 PM, Jack Satterfield wrote:
My KPA500 works great on all bands except 6 meters
Completely dead on 6 meters, does not sense frequency as it
does on all other
My KPA500 works great on all bands except 6 meters
Completely dead on 6 meters, does not sense frequency as it
does on all other bands . any ideas before sending it in?
Thanks,
Jack
W4GRJ
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I'm not clear whether you are talking about the SWR before or after the
tuner, but efficiency is determined by the load seen by the PA, which
has two degrees of freedom (reactance and resistance), both of which can
vary either side of the ideal. SWR reduces this to a single variable,
that does
: [Elecraft] KPA-1500 ATU not working well
Here is a picture and some plot images:
http://www.kn5l.net/Elecraft/CP1/
Not super accurate 60 and 100 Ohm loads, but provides an insight of the coupler
operation.
John KN5L
On 06/22/2018 04:15 PM, Wes Stewart wrote:
> I don't quite underst
Hi John,
Well if a picture is worth a thousand words a graph is worth at least
10,000.
THANKS for the posting!
73,
Bob
K2TK ex KN2TKR (1956) & K2TKR
On 6/22/2018 6:27 PM, John Oppenheimer wrote:
Here is a picture and some plot images:
http://www.kn5l.net/Elecraft/CP1/
Not su
Offhand, since they are adamantly opposed to using operational ALC, I could see
incorporating a "1500 W" gain calibration, as they do with K3s. They could read
the output power at several frequencies per band and save the gain settings.
This assumes they have enough memory in the K3 to save the
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